proof-of-work | Proof of Work with SHA256 and Bloom filter | Hashing library
kandi X-RAY | proof-of-work Summary
kandi X-RAY | proof-of-work Summary
Proof of Work with SHA256 and Bloom filter
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Top functions reviewed by kandi - BETA
- MurmurHash .
- Removes two 32 - bit integers .
- Creates a new Verifier .
- compute the sum of a and b
- Write in buffer to a given buffer .
- Creates a new bloom filter
- Read from buffer at a given buffer .
- The 16 - bit implementation
- Creates a solver object
proof-of-work Key Features
proof-of-work Examples and Code Snippets
Community Discussions
Trending Discussions on proof-of-work
QUESTION
My question is quite simple, why can't every node in the network follow the same principle for verifying transactions:
- Check that the transaction has a unique ID
- Check that the digital signature is correct using the public-key of the person sending money
No one can fake sending money on the behalf of someone else because they do not have that person's private-key and hence cannot create a valid digital signature for that transaction. No one can copy a previous transaction with a valid digital signature and broadcast to other nodes again because the ID must be unique.
This would also remove the notion of "blocks" in a "chain" and lead to a simple ledger.
I am aware that blockchains already implement this simple system of digital signatures. What I don't understand is, what is the necessity of further verification through proof-of-work? How could someone possibly create an illegitimate block (with one or more illegitimate transactions) which would require this further layer of security? What am I missing here?
...ANSWER
Answered 2021-Sep-27 at 14:54You are missing double spending problem. If you have some amount of currency you can create unlimited amount of valid transactions. How you would know which one is correct?
This is why Proof-of-Work was implemented. It allows nodes to check which transactions are valid, and which try to double spend.
QUESTION
I am trying to send a get request to an api and get a response. My code is working fine but there is a problem with body of response, I am getting numbers before and after body of the response. Here is my code:
...ANSWER
Answered 2021-Jun-29 at 18:19I am missing something but what?
You are not taking into account that these responses are using the chunked transfer encoding format (via the Transfer-Encoding: chunked header) to send the body data in chunks instead of a single byte stream, as you are expecting. See RFC 2616 Section 3.6.1 and RFC 7230 Section 4.1 for more details on the chunked format.
What are they?
The numbers you are referring to are chunk size indicators.
In the 1st response shown, there is a single chunk of data whose byte size is
4a0(0x4A0 hex, 1184 decimal), followed by a terminating chunk whose byte size is0.In the 2nd response shown, there is a single chunk of data whose byte size is
bcd(0xBCD hex, 3021 decimal), followed by a terminating chunk whose byte size is0.
The 0-length chunk ends the body data (there is no Content-Length or Connection: close header present to end the responses otherwise).
You won't be able to use a simple recv() loop to read chunked bodies. You have to detect the chunked header, and if present then read and parse each chunk individually. Read a chunk size, skip up to the following CRLF, read the specified number of bytes, skip up to the following CRLF. Repeat until a 0-length chunk is reached. Then read a set of trailing HTTP headers that may follow the chunks, overwriting any headers that you read before the body.
See the pseudo code I present in this answer and this answer.
QUESTION
This is a script that is a simple proof of work and it's in md5 algo. Is there any way I can use it to transfer it to sha256?
...ANSWER
Answered 2021-Mar-14 at 10:03from hashlib import sha256
string = "1"
complete = False
n = 0
while complete == False:
curr_string = string + str(n)
curr_hash = sha256(curr_string.encode()).hexdigest()
n = n + 1
print(curr_hash + ' ' + curr_hash[:4])
QUESTION
As I sad in the title, why is IBFT not used as consensus protocol in public blockchains? After all, it is Byzantine-Fault-Tolerant and prevents forks, which is more than for example Proof-of-Work in Bitcoin does...
...ANSWER
Answered 2021-Jan-18 at 11:11The use of the IBFT consensus (as well as any consensus of the BFT group) involves the allocation of a special pool of validators, no more than a few dozen, which, by collecting explicit confirmations from each other, determine the validity of the block (or a separate transaction) and the possibility of its inclusion in the chain (for example, this is how Ripple works). For the public Ethereum, this, firstly, violates the very concept of equality of nodes in the network, and secondly, when trying to expand the pool of validators to a comparable number of nodes participating in the public Ethereum, it will inevitably lead to the collapse of the consensus process.
Therefore, in the public Ethereum, PoW is used, which does not imply the presence of "special" nodes and any explicit confirmations - the consensus is based on the fact that following the general rules: finding a "lucky" hash and adding a new block to the longest fork, the node has the highest probability of receiving block creation rewards.
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